| Title | Safety effects of horizontal curve and grade combinations on rural two-lane highways |
|---|---|
| Record ID | 61557 |
| Personal Name Creator |
Bauer, Karin M.; Harwood, Douglas W. |
| Corporate Creator | MRIGlobal (Firm) |
| Corporate Contributor |
United States. Federal Highway Administration. Office of Safety Research and Development |
| Publisher | United States. Federal Highway Administration. Office of Safety Research and Development |
| Publication Date | 20140101 |
| Language | English |
| Abstract | This report summarizes the results of research undertaken to quantify the safety effects of five types of horizontal and vertical alignment combinations for rural two-lane highways. The research is based on Federal Highway Administration Highway Safety Information System data for Washington State, including crash records from 2003 to 2008. The outcome is a set of safety prediction models for fatal and injury and property damage only crashes. To present the results in a form suitable for incorporation in the American Association of State Highway and Transportation Officials Highway Safety Manual, crash modification factors representing safety performance relative to level tangents were developed from these models for each of the five combinations of horizontal and vertical alignment—horizontal curves and tangents on straight grades, horizontal curves and tangents at type 1 crest vertical curves, horizontal curves and tangents at type 1 sag vertical curves, horizontal curves and tangents at type 2 crest vertical curves, and horizontal curves and tangents at type 2 sag vertical curves. |
| Rosap ID | dot:35716 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/35716 |
| TRT Terms | Highway curves; Highway safety; Rural highways; Two lane highways; Highway grades; Road improvements; Highway factors in crashes |
| General Subjects | Safety; Horizontal curves; Vertical curves; Grade interactions; Crests; Sags; Rural two-lane highways; Crash modeling; Safety performance functions; Crash modification factors |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1516479 |
| Contract Number | DTFH61-11-C-00050 |
| Report Number | FHWA-HRT-13-077 |
| Availability | Federal Highway Administration |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/61000/61500/61557/13077.pdf |
| Format | |
| Database | NTL Digital Repository |